Exclude specific records from a list

So I'm currently putting some products via a list call like this:

  // load records from 'isp_list'
  list($isp_listRecords, $isp_listMetaData) = getRecords(array(
    'tableName'   => 'isp_list',
    'limit'       => '5',
    'loadCreatedBy' => false,
    'where'       => " category LIKE '%Telecoms%' ",
    'allowSearch' => false,
    'orderBy'       => $orderByxxxxx,
  ));

But I'd like to specifically exclude a couple of products - using their Record Numbers (field 'num') - from being included in the list output. I'm just wondering how I do that?